AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

sábado, 6 de setembro de 2014

Power Loss Modeling of Individual IGBT and Advanced Voltage
Balancing Scheme for MMC in VSC-HVDC System
Gum Tae Son*, Soo Hyoung Lee** and Jung-Wook Park†Abstract – This paper presents the new power dissipation model of individual switching device in a
high-level modular multilevel converter (MMC), which can be mostly used in voltage sourced
converter (VSC) based high-voltage direct current (HVDC) system and flexible AC transmission
system (FACTS). Also, the voltage balancing method based on sorting algorithm is newly proposed to
advance the MMC functionalities by effectively adjusting switching variations of the sub-module
(SM). The proposed power dissipation model does not fully calculate the average power dissipation for
numerous switching devices in an arm module. Instead, it estimates the power dissipation of every
switching element based on the inherent operational principle of SM in MMC. In other words, the
power dissipation is computed in every single switching event by using the polynomial curve fitting
model with minimum computational efforts and high accuracy, which are required to manage the large
number of SMs. After estimating the value of power dissipation, the thermal condition of every
switching element is considered in the case of external disturbance. Then, the arm modeling for highlevel
MMC and its control scheme is implemented with the electromagnetic transient simulation
program. Finally, the case study for applying to the MMC based HVDC system is carried out to select
the appropriate insulated-gate bipolar transistor (IGBT) module in a steady-state, as well as to estimate
the proper thermal condition of every switching element in a transient state.
LINKhttp://www.jeet.or.kr/LTKPSWeb/pub/pubfpfile.aspx?ppseq=1039